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MySQL MHA高可用环境部署[ mysql数据库 ]

mysql数据库时间：2024-12-24 19:13:38

作者：文/会员上传

如何提高mysql查询效率

简介：

一，安装MHA基本环境安装MHA节点（1）基本环境说明
角色IP地址主机名=========================================主机192.168.1.121节点1从机192.168.1.122节点2从机192.168.1.123

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一，安装MHA基本环境

安装MHA节点

（1）基本环境说明

角色IP地址主机名

=========================================

主机192.168.1.121节点1

从机192.168.1.122节点2

从机192.168.1.123节点3

监视主机192.168.1.125节点5

（2）在node1，node2，node3，node5中操作：

＃vi / etc / hosts

192.168.1.121 node1

192.168.1.122 node2

192.168.1.123 node3

192.168.1.125 node5

安装MHA节点节点软件包：

＃rpm -ivhhttp://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm＃yum

install perl-DBD-MySQL perl-CPAN -y

＃tar xf mha4mysql -node-0.56.tar.gz

＃cd mha4mysql-node-0.56

＃perl Makefile.PL

＃make && make install

安装MHA

在节点5管理节点上操作：注：MHA管理器主机也是需要安装MHA节点，MHA管理器

＃yum install perl-DBD-MySQL perl-CPAN perl-Config-Tiny perl-Log-Dispatch perl-Parallel-ForkManager perl-time-HiRes -y

＃tar xf mha4mysql-manager-0.56.tar.gz

＃cd mha4mysql-manager -0.56

＃perl Makefile.PL

＃make && make install

＃说明：安装的脚本程序都在/ usr / local / bin /目录下。

3.节点间配置SSH登录无密码验证（MHA主机之间使用密钥登录）

在node5（Monitor）中：

＃ssh-keygen -t rsa

＃ssh-copy-id -i /root/.ssh/id_rsa.pub root @ node1

＃ssh-copy-id -i /root/.ssh/id_rsa.pub root @ node2

＃ssh-copy-id -i /root/.ssh/id_rsa.pub root @ node3

在node1（Master）中：

＃ssh-keygen -t rsa

＃ssh-copy-id -i /root/.ssh/id_rsa.pub root @ node2

＃ssh-copy-id -i /root/.ssh/id_rsa.pub root @ node3

＃ssh-copy-id -i /root/.ssh/id_rsa.pub root @ node5

在node2（slave）中：

＃ssh-keygen -t rsa

＃ssh-copy-id -i /root/.ssh/id_rsa.pub root @ node1

＃ssh-copy-id -i /root/.ssh/id_rsa.pub root @ node3

＃ssh-copy-id -i /root/.ssh/id_rsa.pub root @ node5

在node3（slave）中：

＃ssh-keygen -t rsa

＃ssh-copy-id -i /root/.ssh/id_rsa.pub root @ node1

＃ssh-copy-id -i /root/.ssh/id_rsa.pub root @ node2

＃ssh-copy-id -i /root/.ssh/id_rsa.pub root @ node5

二，搭建主从复制环境

主从复制环境配置过程

（1）mysql安装过程略，但是三节点要创建如下链接

node1（主），node2（主备从），node3（从）

注意：创建如下链接：

ln -s / usr / local / mysql / bin / * / usr / local / bin /

node1 my.cnf

server-id = 1

binlog-format = ROW

log-bin = master-bin

log-bin-index = master-bin.index

log-slave-updates = true

relay_log_purge = 0

node2 my.cnf

server-id = 2

binlog-format = ROW

log-bin = master-bin

log-bin-index = master-bin.index

log-slave-updates = true

relay_log_purge = 0

node3 my.cnf

binlog-format = ROW

log-bin = mysql-bin

relay-log = slave-relay-bin

relay-log-index = slave-relay-bin.index

log-slave-updates = true

server-id = 11

skip-name- resolve

relay_log_purge = 0

（2）在node1（Master）上备份一份完整的数据：

＃mysqldump -uroot -p123456 --master-data = 2 - 单事务-R - triggers -A> all.sql

其中--master-data = 2代表备份时刻记录主的Binlog位置和位置。

（3）在node1（Master）上创建复制用户：

mysql>授予复制从机*。*到'123456'确定的'repl'@'192.168.1.%';

刷新权限;

（4）查看主库备份时的binlog名称和位置，MASTER_LOG_FILE和MASTER_LOG_POS：

＃head -n 30 all.sql |grep'CHANGE MASTER TO'

- CHANGE MASTER TO MASTER_LOG_FILE ='master-bin.000004'，MASTER_LOG_POS = 120;

（5）把备份复制到192.168.1.122和192.168.1.123

＃scp all.sql

192.168.1.122:/root/＃scp all.sql 192.168.1.123:/root/

（6）分别在两台服务器上导入备份，执行复制相关命令

在node2，node3主机上操作：

＃mysql -uroot -p123456 <all.sql

停止从站

CHANGE MASTER TO

MASTER_HOST ='192.168.1.121'，

MASTER_USER ='repl'，

MASTER_PASSWORD ='123456'，

MASTER_LOG_FILE ='master-bin.000004'，

MASTER_LOG_POS = 120;

mysql> start slave;

显示从属状态\ G

创建MHA管理用户，在主上创建。

将*。*的所有权限授予'123456'标识为'root'@'192.168.1.%'的权限;

刷新权限;

三，配置Keepal VIP

vip配置可以采用两种方式，一种通过keepalived的方式管理虚拟ip的浮动;一人是通过脚本方式，本文通过keepalived方式实现

1.在node1（Master）与node2（备选主节点）安装keepalived。

＃wget的http://www.keepalived.org/software/keepalived-1.2.12.tar.gz

＃焦油XF的keepalived-1.2.12.tar.gz

＃CD的keepalived-1.2.12

＃的./configure前缀= / usr / local / keepalived

＃make && make install

＃cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/＃cp

/ usr / local / keepalived / etc / sysconfig / keepalived / etc / sysconfig /

＃mkdir / etc / keepalived

＃cp /usr/local/keepalived/etc/keepalived/keepalived.conf / etc / keepalived /

＃cp / usr / local / keepalived / sbin / keepalived / usr / sbin /

配置keepalived的配置文件，在node1（master）上配置操作如下：

注意：keepalived配置成备份 - 备份，即IP地址切换后，主起来后IP地址不切换，本文监控脚本由MHA提供，keepalived不提供对mysqld的监控。

＃vi /etc/keepalived/keepalived.conf

！保持配置文件

global_defs {

notification_email {

abc@163.com

}

notification_email_from dba@dbserver.com

smtp_server 127.0.0.1

smtp_connect_timeout 30

router_id MySQL-HA

}

vrrp_instance VI_1 {

state BACKUP

interface eth0

virtual_router_id 51

priority 150

advert_int 1

nopreempt

身份验证{

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

192.168.1.130

}

配置keepalived的配置文件，在node2（备用节点）上配置操作如下：

＃vi /etc/keepalived/keepalived.conf

！保持配置文件

global_defs {

notification_email {

abc@163.com

}

notification_email_from dba@dbserver.com

smtp_server 127.0.0.1

smtp_connect_timeout 30

router_id MySQL-HA

}

vrrp_instance VI_1 {

state BACKUP

interface eth0

virtual_router_id 51

priority 120

advert_int 1

nopreempt

身份验证{

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

192.168.1.130

}

4. node1，node2启动keepalived服务

＃service keepalived start

＃chkconfig keepalived on

5. node1查看VIP启动情况

[root @

node1]＃ipa 1：lo：<LOOPBACK，UP，LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN

link / loopback 00：00：00：00：00：00 brd 00：00：00：00：00 ：00

inet 127.0.0.1/8 scope host lo

inet6 :: 1/128 scope host

valid_lft forever preferred_lft forever

2：eth0：<BROADCAST，MULTICAST，UP，LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000

link / ether 00：0c ：29：4e：53：71 brd ff：ff：ff：ff：ff：ff

inet 192.168.1.121/24 brd 192.168.1.255范围全局eth0

inet 192.168.1.130/32范围全局eth0

inet6 fe80 :: 20c：29ff： fe4e：5371/64范围链接

valid_lft永远preferred_lft永远

四，配置MHA

监控创建MHA的工作目录，并且创建相关配置文件（在软件包解压后的目录里面有样例配置文件）。

＃mkdir -p / etc / masterha

＃mkdir -p / var / log / masterha / app1

＃cp mha4mysql-manager-0.56 / samples / conf / app1.cnf / etc / masterha /

修改app1.cnf配置文件，修改后的文件内容如下：

＃cat /etc/masterha/app1.cnf

[server default]

manager_workdir = / var / log / masterha / app1

manager_log = / var / log / masterha / app1 / manager.log

master_binlog_dir = / usr / local / mysql / data /

master_ip_failover_script = / usr / local / bin / master_ip_failover

master_ip_online_change_script = / usr / local / bin / master_ip_online_change

password = 123456

user = root

ping_interval = 1

remote_workdir = / tmp

repl_password = 123456

repl_user = repl

report_script = / usr / local / bin / send_report

ssh_user = root

[server1]

hostname = 192.168.1.121

port = 3306

[server2]

hostname = 192.168.1.122

port = 3306

candidate_master = 1

check_repl_delay = 0

[server3]

hostname = 192.168.1.123

port = 3306

说明：

master_ip_failover_script = / usr / local / bin / master_ip_failover#MHA自动切换执行的脚本，需要修改

master_ip_online_change_script = / usr / local / bin / master_ip_online_change＃手动

切换需要执行的脚本，需要修改report_script = / usr / local / bin / send_report＃切换时发送邮件进行报告，需要修改

2.设置中继日志的清除方式（在每个从节点上）：

（1）在节点2，节点3从节点上操作：

将relay_log_purge = 0加入my.cnf配置文件，前面已经配置。

（2）设定定期清理继电器脚本（node2，node3上操作）：

＃猫purge_relay_log.sh

＃！/斌/ bash的

用户=根

的passwd = 123456

端口= 3306

LOG_DIR = '/数据/ masterha /日志'

WORK_DIR = '/数据'

清除= '在/ usr / local / bin目录/ purge_relay_logs'

如果[！-d $ log_dir]

then

mkdir $ log_dir -p

$ purge --user = $ user --password = $ passwd --disable_relay_log_purge --port = $ port --workdir = $ work_dir >> $ log_dir / purge_relay_logs.log 2>＆1

配置定时计划任务

＃crontab-e 0 4 * * * / bin / bash /root/purge_relay_log.sh

要求把keepalived服务引入MHA，我们只需要修改切换是触发的脚本文件master_ip_failover即可，在该脚本中添加在master发生宕机时对keepalived的处理。

（1）编辑脚本/ usr / local / bin / master_ip_failover，修改后如下：

＃vi / usr / local / bin / master_ip_failover

＃！/ usr / bin / env perl

use strict;

使用警告FATAL =>'all';

使用Getopt :: Long;

我的（

$命令，$ ssh_user，$ orig_master_host，$ orig_master_ip，

$ orig_master_port，$ new_master_host，$ new_master_ip，$ new_master_port

）;

我的$ vip ='192.168.1.130';

我的$ ssh_start_vip =“/etc/init.d/keepalived start”;

我的$ ssh_stop_vip =“/etc/init.d/keepalived stop”;

GetOptions（

'command = s'=> \ $ command，

'ssh_user = s'=> \ $ ssh_user，

'orig_master_host = s'=> \ $ orig_master_host，

'orig_master_ip = s'=> \ $ orig_master_ip，

'orig_master_port = '=> \ $ orig_master_port，

'new_master_host = s'=> \ $ new_master_host，

'new_master_ip = s'=> \ $ new_master_ip，

'new_master_port = i'=> \ $ new_master_port，

）;

exit＆main（）;

sub main {

print“\ n \ nIN SCRIPT TEST ==== $ ssh_stop_vip == $ ssh_start_vip === \ n \ n”;

if（$ command eq“stop”|| $ command eq“stopssh”）{

my $ exit_code = 1;

eval {

print“禁用旧主机上的VIP：$ orig_master_host \ n”;

＆stop_vip（）;

$ exit_code = 0;

};

if（$ @）{

warn“Got Error：$ @ \ n”;

退出$ exit_code;

}

exit $ exit_code;

}

elsif（$ command eq“start”）{

我的$ exit_code = 10;

eval {

print“启用VIP - $ vip on the new master - $ new_master_host \ n”;

＆start_vip（）;

$ exit_code = 0;

};

if（$ @）{

warn $ @;

退出$ exit_code;

}

exit $ exit_code;

} {

el}{

“}”{“}”\“”

退出0;

}

else {

＆usage（）;

出口1;

}

sub start_vip（）{

`ssh $ ssh_user \ @ $ new_master_host \“$ ssh_start_vip \”`;

}

＃一个简单的系统调用，禁用在old_master

子上的VIPstop_vip（）{

`ssh $ ssh_user \ @ $ orig_master_host \“$ ssh_stop_vip \”`;

}}

sub usage {

“用法：master_ip_failover --command = start | stop | stopssh | status --orig_master_host = host --orig_master_ip = ip --orig_master_port = port --new_master_host = host --new_master_ip = ip --new_master_port = port \ n“;

}

（2）编辑脚本master_ip_online_change，修改后如下：

＃！/ usr / bin / env perl

＃＃

这个程序是免费的软件;您可以

根据

＃自由软件基金会发布的GNU通用公共许可证的条款重新分配和/或修改＃许可证的版本2或

＃（根据您的选择）任何更高版本。

＃＃

这个程序是分发的，希望它是有用的，

但没有任何的保证;甚至没有

＃适销性或适用于特定用途的默示保证。有关

详细信息，请参阅＃GNU通用公共许可证。

＃＃

您应该已经收到了GNU通用公共许可证

＃的副本以及该程序;如果不，

##注意：这是一个示例脚本，不完整。根据您的环境修改脚本。

使用严格

使用警告FATAL =>'all';

使用Getopt :: Long;

使用MHA :: DBHelper;

使用MHA :: NodeUtil;

使用Time :: HiRes qw（sleep gettimeofday tv_interval）;

使用Data :: Dumper;

我的$ _tstart;

我的$ _running_interval = 0.1;

我的（

$命令，$ orig_master_is_new_slave，$ orig_master_host，

$ orig_master_ip，$ orig_master_port，$ orig_master_user，

$ orig_master_password，$ orig_master_ssh_user，$ new_master_host，

$ new_master_ip，$ new_master_port，$ new_master_user，

$ new_master_password，$ new_master_ssh_user

）

我的$ vip ='192.168.1.130/24';

我的$ key ='1';

我的$ ssh_start_vip =“/ sbin / ifconfig eth0：$ key $ vip”;

我的$ ssh_stop_vip =“/ sbin / ifconfig eth0：$ key down”;

我的$ orig_master_ssh_port = 22;

我的$ new_master_ssh_port = 22;

exit＆main（）;

sub current_time_us {

my（$ sec，$ microsec）= gettimeofday（）;

我的$ curdate = localtime（$ sec）;

返回$ curdate。“”。sprintf（“％06d”，$ microsec）;

}

sub sleep_until {

my $ elapsed = tv_interval（$ _ tstart）;

if（$ _running_interval> $ elapsed）{

sleep（$ _running_interval - $ elapsed）;

}

sub get_threads_util {

my $ dbh = shift;

我的$ my_connection_id = shift;

我的$ running_time_threshold = shift;

我的$ type = shift;

$ running_time_threshold = 0，除非（$ running_time_threshold）;

$ type = 0，除非（$ type）;

我的@threads;

我的$ sth = $ dbh-> prepare（“SHOW PROCESSLIST”）;

$ sth-> execute（）;

while（my $ ref = $ sth-> fetchrow_hashref（））{

my $ id = $ ref - > {Id};

我的$ user = $ ref - > {User};

我的$ host = $ ref - > {Host};

我的$ command = $ ref - > {Command};

我的$ state = $ ref - > {State};

我的$ query_time = $ ref - > {Time};

我的$ info = $ ref - > {Info};

$ info =s / ^ \ s *（。*？）\ s * $ / $ 1 / if defined（$ info）;

next if（$ my_connection_id == $ id）;

next if（defined（$ query_time）&& $ query_time <$ running_time_threshold）;

next if（defined（$ command）&& $ command eq“Binlog Dump”）;

next if（defined（$ user）&& $ user eq“system user”）;

if（$ type> = 1）{

next if（defined（$ command）&& $ command eq“Sleep”）;

next if（defined（$ command）&& $ command eq“Connect”）;

}

if（$ type> = 2）{

next if（defined（$ info）&& $ info =m / ^ select / i）;

next if（defined（$ info）&& $ info =m / ^ show / i）;

}

推送@threads，$ ref;

}

return @threads;

}

sub main {

if（$ command eq“stop”）{

##正当地杀死当前主机上的连接

＃1.在新主机

＃2上设置read_only = 1。DROPUSER使得没有应用用户可以建立新的连接

＃3。在当前主机

＃4上设置read_only =1。杀死当前查询

＃*任何数据库访问失败都会导致脚本死机。

我的$ exit_code = 1;

eval {

##在新主机上设置read_only = 1（以避免意外）

我的$ new_master_handler = new MHA :: DBHelper（）;

＃args：hostname，port，user，password，raise_error（die_on_error）_or_not

$ new_master_handler-> connect（$ new_master_ip，$ new_master_port，

$ new_master_user，$ new_master_password，1）;

打印current_time_us（）。“设置read_only在新的主人..”;

$ new_master_handler-> enable_read_only（）;

if（$ new_master_handler-> is_read_only（））{

print“ok。\ n”;

}

else {

die“Failed！\ n”;

}

$ new_master_handler-> disconnect（）;

＃连接到原始主机，如果发生任何数据库错误，则会死亡

$ orig_master_handler = new MHA :: DBHelper（）;

$ orig_master_handler-> connect（$ orig_master_ip，$ orig_master_port，

$ orig_master_user，$ orig_master_password，1）;

##删除应用程序用户，以便没有人可以连接。事先禁用每会话binlog

$ orig_master_handler-> disable_log_bin_local（）;

打印current_time_us（）。“在原始主机上吸引应用用户.. \ n”;

#FIXME_xxx_drop_app_user（$ orig_master_handler）;

等待N * 100毫秒，以便当前的连接可以退出

我的$ time_until_read_only = 15;

$ _tstart = [gettimeofday];

我的@threads = get_threads_util（$ orig_master_handler - > {dbh}，

$ orig_master_handler - > {connection_id}）;

while（$ time_until_read_only> 0 && $＃threads> = 0）{

if（$ time_until_read_only％5 == 0）{

printf

“％s等待所有正在运行的％d线程断开连接..（最大％d毫秒）\ n”

current_time_us（），$＃threads + 1，$ time_until_read_only * 100;

if（$＃threads <5）{

print Data :: Dumper-> new（[$ _]） - > Indent（0） - > Terse（1） - > Dump。

“\ n” foreach（@threads）;

}

sleep_until（）;

$ _tstart = [gettimeofday];

$ time_until_read_only--;

@threads = get_threads_util（$ orig_master_handler - > {dbh}，

$ orig_master_handler - > {connection_id}）;

}}

##在当前主设备上设置read_only = 1，以便没有人（SUPER除外）可以写入

print_time_us（）。“在原始主机上设置read_only = 1”。

$ orig_master_handler-> enable_read_only（）;

if（$ orig_master_handler-> is_read_only（））{

print“ok。\ n”;

}

else {

die“Failed！\ n”;

}}

等待M * 100毫秒，以便当前的更新查询可以完成

我的$ time_until_kill_threads = 5;

@threads = get_threads_util（$ orig_master_handler - > {dbh}，

$ orig_master_handler - > {connection_id}）;

while（$ time_until_kill_threads> 0 && $＃threads> = 0）{

if（$ time_until_kill_threads％5 == 0）{

printf

“％s等待所有运行的％d查询断开连接..（最大％d毫秒）\ n”

current_time_us（），$＃threads + 1，$ time_until_kill_threads * 100;

if（$＃threads <5）{

print Data :: Dumper-> new（[$ _]） - > Indent（0） - > Terse（1） - > Dump。“\ n”

foreach（@threads）;

}

sleep_until（）;

$ _tstart = [gettimeofday];

$ time_until_kill_threads--;

@threads = get_threads_util（$ orig_master_handler - > {dbh}，

$ orig_master_handler - > {connection_id}）;

}}

## Terminating all threads

print current_time_us() . " Killing all application threads..\n";

$orig_master_handler->kill_threads(@threads) if ( $#threads >= 0 );

print current_time_us() . " done.\n";

$orig_master_handler->enable_log_bin_local();

$orig_master_handler->disconnect();

## After finishing the script, MHA executes FLUSH TABLES WITH READ LOCK

eval {

`ssh -p$orig_master_ssh_port $orig_master_ssh_user\@$orig_master_host \" $ssh_stop_vip \"`;

};

if ($@) {

warn $@;

}

$exit_code = 0;

};

if ($@) {

warn "Got Error: $@\n";

exit $exit_code;

}

exit $exit_code;

}

elsif ( $command eq "start" ) {

## Activating master ip on the new master

# 1. Create app user with write privileges

# 2. Moving backup script if needed

# 3. Register new master's ip to the catalog database

# We don't return error even though activating updatable accounts/ip failed so that we don't interrupt slaves' recovery.

# If exit code is 0 or 10, MHA does not abort

my $exit_code = 10;

eval {

my $new_master_handler = new MHA::DBHelper();

# args: hostname, port, user, password, raise_error_or_not

$new_master_handler->connect( $new_master_ip, $new_master_port,

$new_master_user, $new_master_password, 1 );

## Set read_only=0 on the new master

$new_master_handler->disable_log_bin_local();

print current_time_us() . " Set read_only=0 on the new master.\n";

$new_master_handler->disable_read_only();

## Creating an app user on the new master

print current_time_us() . " Creating app user on the new master..\n";

#FIXME_xxx_create_app_user($new_master_handler);

$new_master_handler->enable_log_bin_local();

$new_master_handler->disconnect();

## Update master ip on the catalog database, etc

`ssh -p$new_master_ssh_port $new_master_ssh_user\@$new_master_host \" $ssh_start_vip \"`;

$exit_code = 0;

};

if ($@) {

warn "Got Error: $@\n";

exit $exit_code;

}

exit $exit_code;

}

elsif ( $command eq "status" ) {

# do nothing

exit 0;

}

else {

&usage();

exit 1;

}

sub usage {

"Usage: master_ip_online_change --command=start|stop|status --orig_master_host=host --orig_master_ip=ip --orig_master_port=port --new_master_host=host --new_master_ip=ip --new_master_port=port\n";

die;

}

(3) 编辑脚本send_report，修改后如下:

#!/usr/bin/perl

use strict;

use warnings FATAL => 'all';

use Mail::Sender;

use Getopt::Long;

#new_master_host and new_slave_hosts are set only when recovering master succeeded

my ( $dead_master_host, $new_master_host, $new_slave_hosts, $subject, $body );

my $smtp='smtp.163.com';

my $mail_from='xxxx';

my $mail_user='xxxxx';

my $mail_pass='xxxxx';

my $mail_to=['xxxx','xxxx'];

GetOptions(

'orig_master_host=s' => \$dead_master_host,

'new_master_host=s' => \$new_master_host,

'new_slave_hosts=s' => \$new_slave_hosts,

'subject=s' => \$subject,

'body=s' => \$body,

);

mailToContacts($smtp,$mail_from,$mail_user,$mail_pass,$mail_to,$subject,$body);

sub mailToContacts {

my ( $smtp, $mail_from, $user, $passwd, $mail_to, $subject, $msg ) = @_;

open my $DEBUG, "> /tmp/monitormail.log"

or die "Can't open the debug file:$!\n";

my $sender = new Mail::Sender {

ctype => 'text/plain; charset=utf-8',

encoding => 'utf-8',

smtp => $smtp,

from => $mail_from,

auth => 'LOGIN',

TLS_allowed => '0',

authid => $user,

authpwd => $passwd,

to => $mail_to,

subject => $subject,

debug => $DEBUG

};

$sender->MailMsg(

{ msg => $msg,

debug => $DEBUG

}

) or print $Mail::Sender::Error;

return 1;

}

# Do whatever you want here

exit 0;

五、MHA的日常管理

1. 检查SSH配置(node5 Monitor 监控节点上操作)，如下：

# masterha_check_ssh --conf=/etc/masterha/app1.cnf

Sun May 1 22:05:12 2016 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.

Sun May 1 22:05:12 2016 - [info] Reading application default configuration from /etc/masterha/app1.cnf..

Sun May 1 22:05:12 2016 - [info] Reading server configuration from /etc/masterha/app1.cnf..

Sun May 1 22:05:12 2016 - [info] Starting SSH connection tests..

Sun May 1 22:05:14 2016 - [debug]

Sun May 1 22:05:12 2016 - [debug] Connecting via SSH from root@192.168.1.121(192.168.1.121:22) to root@192.168.1.122(192.168.1.122:22)..

Sun May 1 22:05:13 2016 - [debug] ok.

Sun May 1 22:05:13 2016 - [debug] Connecting via SSH from root@192.168.1.121(192.168.1.121:22) to root@192.168.1.123(192.168.1.123:22)..

Sun May 1 22:05:13 2016 - [debug] ok.

Sun May 1 22:05:14 2016 - [debug]

Sun May 1 22:05:13 2016 - [debug] Connecting via SSH from root@192.168.1.122(192.168.1.122:22) to root@192.168.1.121(192.168.1.121:22)..

Sun May 1 22:05:13 2016 - [debug] ok.

Sun May 1 22:05:13 2016 - [debug] Connecting via SSH from root@192.168.1.122(192.168.1.122:22) to root@192.168.1.123(192.168.1.123:22)..

Sun May 1 22:05:14 2016 - [debug] ok.

Sun May 1 22:05:14 2016 - [debug]

Sun May 1 22:05:13 2016 - [debug] Connecting via SSH from root@192.168.1.123(192.168.1.123:22) to root@192.168.1.121(192.168.1.121:22)..

Sun May 1 22:05:14 2016 - [debug] ok.

Sun May 1 22:05:14 2016 - [debug] Connecting via SSH from root@192.168.1.123(192.168.1.123:22) to root@192.168.1.122(192.168.1.122:22)..

Sun May 1 22:05:14 2016 - [debug] ok.

Sun May 1 22:05:14 2016 - [info]All SSH connection tests passed successfully.

2. 检查整个复制环境状况(node5 监控节点上操作)，如下：

# masterha_check_repl --conf=/etc/masterha/app1.cnf

Sun May 1 22:46:44 2016 - [warning] Global configuration file /etc/masterha_default.cnf not found. Skipping.

Sun May 1 22:46:44 2016 - [info] Reading application default configuration from /etc/masterha/app1.cnf..

Sun May 1 22:46:44 2016 - [info] Reading server configuration from /etc/masterha/app1.cnf..

Sun May 1 22:46:44 2016 - [info] MHA::MasterMonitor version 0.56.

Sun May 1 22:46:45 2016 - [info] GTID failover mode = 0

Sun May 1 22:46:45 2016 - [info] Dead Servers:

Sun May 1 22:46:45 2016 - [info] Alive Servers:

Sun May 1 22:46:45 2016 - [info] 192.168.1.121(192.168.1.121:3306)

Sun May 1 22:46:45 2016 - [info] 192.168.1.122(192.168.1.122:3306)

Sun May 1 22:46:45 2016 - [info] 192.168.1.123(192.168.1.123:3306)

Sun May 1 22:46:45 2016 - [info] Alive Slaves:

Sun May 1 22:46:45 2016 - [info] 192.168.1.122(192.168.1.122:3306) Version=5.6.29-log (oldest major version between slaves) log-bin:enabled

Sun May 1 22:46:45 2016 - [info] Replicating from 192.168.1.121(192.168.1.121:3306)

Sun May 1 22:46:45 2016 - [info] Primary candidate for the new Master (candidate_master is set)

Sun May 1 22:46:45 2016 - [info] 192.168.1.123(192.168.1.123:3306) Version=5.6.29-log (oldest major version between slaves) log-bin:enabled

Sun May 1 22:46:45 2016 - [info] Replicating from 192.168.1.121(192.168.1.121:3306)

Sun May 1 22:46:45 2016 - [info] Current Alive Master: 192.168.1.121(192.168.1.121:3306)

Sun May 1 22:46:45 2016 - [info] Checking slave configurations..

Sun May 1 22:46:45 2016 - [info] read_only=1 is not set on slave 192.168.1.122(192.168.1.122:3306).

Sun May 1 22:46:45 2016 - [warning] relay_log_purge=0 is not set on slave 192.168.1.122(192.168.1.122:3306).

Sun May 1 22:46:45 2016 - [info] read_only=1 is not set on slave 192.168.1.123(192.168.1.123:3306).

Sun May 1 22:46:45 2016 - [warning] relay_log_purge=0 is not set on slave 192.168.1.123(192.168.1.123:3306).

Sun May 1 22:46:45 2016 - [info] Checking replication filtering settings..

Sun May 1 22:46:45 2016 - [info] binlog_do_db= , binlog_ignore_db=

Sun May 1 22:46:45 2016 - [info] Replication filtering check ok.

Sun May 1 22:46:45 2016 - [info] GTID (with auto-pos) is not supported

Sun May 1 22:46:45 2016 - [info] Starting SSH connection tests..

Sun May 1 22:46:46 2016 - [info] All SSH connection tests passed successfully.

Sun May 1 22:46:46 2016 - [info] Checking MHA Node version..

Sun May 1 22:46:47 2016 - [info] Version check ok.

Sun May 1 22:46:47 2016 - [info] Checking SSH publickey authentication settings on the current master..

Sun May 1 22:46:47 2016 - [info] HealthCheck: SSH to 192.168.1.121 is reachable.

Sun May 1 22:46:47 2016 - [info] Master MHA Node version is 0.56.

Sun May 1 22:46:47 2016 - [info] Checking recovery script configurations on 192.168.1.121(192.168.1.121:3306)..

Sun May 1 22:46:47 2016 - [info] Executing command: save_binary_logs --command=test --start_pos=4 --binlog_dir=/usr/local/mysql/data/ --output_file=/tmp/save_binary_logs_test --manager_version=0.56 --start_file=master-bin.000008

Sun May 1 22:46:47 2016 - [info] Connecting to root@192.168.1.121(192.168.1.121:22)..

Creating /tmp if not exists.. ok.

Checking output directory is accessible or not..

ok.

Binlog found at /usr/local/mysql/data/, up to master-bin.000008

Sun May 1 22:46:48 2016 - [info] Binlog setting check done.

Sun May 1 22:46:48 2016 - [info] Checking SSH publickey authentication and checking recovery script configurations on all alive slave servers..

Sun May 1 22:46:48 2016 - [info] Executing command : apply_diff_relay_logs --command=test --slave_user='root' --slave_host=192.168.1.122 --slave_ip=192.168.1.122 --slave_port=3306 --workdir=/tmp --target_version=5.6.29-log --manager_version=0.56 --relay_log_info=/usr/local/mysql/data/relay-log.info --relay_dir=/usr/local/mysql/data/ --slave_pass=xxx

Sun May 1 22:46:48 2016 - [info] Connecting to root@192.168.1.122(192.168.1.122:22)..

Checking slave recovery environment settings..

Opening /usr/local/mysql/data/relay-log.info ... ok.

Relay log found at /usr/local/mysql/data, up to node2-relay-bin.000002

Temporary relay log file is /usr/local/mysql/data/node2-relay-bin.000002

Testing mysql connection and privileges..Warning: Using a password on the command line interface can be insecure.

done.

Testing mysqlbinlog output.. done.

Cleaning up test file(s).. done.

Sun May 1 22:46:48 2016 - [info] Executing command : apply_diff_relay_logs --command=test --slave_user='root' --slave_host=192.168.1.123 --slave_ip=192.168.1.123 --slave_port=3306 --workdir=/tmp --target_version=5.6.29-log --manager_version=0.56 --relay_log_info=/usr/local/mysql/data/relay-log.info --relay_dir=/usr/local/mysql/data/ --slave_pass=xxx

Sun May 1 22:46:48 2016 - [info] Connecting to root@192.168.1.123(192.168.1.123:22)..

Checking slave recovery environment settings..

Opening /usr/local/mysql/data/relay-log.info ... ok.

Relay log found at /usr/local/mysql/data, up to slave-relay-bin.000012

Temporary relay log file is /usr/local/mysql/data/slave-relay-bin.000012

Testing mysql connection and privileges..Warning: Using a password on the command line interface can be insecure.

done.

Testing mysqlbinlog output.. done.

Cleaning up test file(s).. done.

Sun May 1 22:46:48 2016 - [info] Slaves settings check done.

Sun May 1 22:46:48 2016 - [info]

192.168.1.121(192.168.1.121:3306) (current master)

+--192.168.1.122(192.168.1.122:3306)

+--192.168.1.123(192.168.1.123:3306)

Sun May 1 22:46:48 2016 - [info] Checking replication health on 192.168.1.122..

Sun May 1 22:46:48 2016 - [info] ok.

Sun May 1 22:46:48 2016 - [info] Checking replication health on 192.168.1.123..

Sun May 1 22:46:48 2016 - [info] ok.

Sun May 1 22:46:48 2016 - [info] Checking master_ip_failover_script status:

Sun May 1 22:46:48 2016 - [info] /usr/local/bin/master_ip_failover --command=status --ssh_user=root --orig_master_host=192.168.1.121 --orig_master_ip=192.168.1.121 --orig_master_port=3306

IN SCRIPT TEST====/etc/init.d/keepalived stop==/etc/init.d/keepalived start===

Checking the Status of the script.. OK

Sun May 1 22:46:48 2016 - [info] OK.

Sun May 1 22:46:48 2016 - [warning] shutdown_script is not defined.

Sun May 1 22:46:48 2016 - [info] Got exit code 0 (Not master dead).

MySQL Replication Health is OK.

[root@node5 masterha]#

3. 开启MHA Manager监控(node5操作)如下：

# mkdir -p /var/log/masterha/app1/

# nohup masterha_manager --conf=/etc/masterha/app1.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null > /var/log/masterha/app1/manager.log 2>&1 &

参数说明：

--remove_dead_master_conf #该参数代表当发生主从切换后，老的主库的ip将会从配置文件中移除。

--manger_log #日志存放位置

--ignore_last_failover #在缺省情况下，如果MHA检测到连续发生宕机，会生成app1.failover.complete文件，会造成MHA管理进程无法启动。

4. 查看MHA Manager监控是否正常：

# masterha_check_status --conf=/etc/masterha/app1.cnf

app1 (pid:2480) is running(0:PING_OK), master:192.168.1.121

5. 查看启动日志(node5操作)如下：

# tail -n20 /var/log/masterha/app1/manager.log

6. 关闭MHA Manage监控：

(1) 关闭

# masterha_stop --conf=/etc/masterha/app1.cnf

(2) 启动

# nohup masterha_manager --conf=/etc/masterha/app1.cnf --remove_dead_master_conf --ignore_last_failover < /dev/null > /var/log/masterha/app1/manager.log 2>&1

六、MHA Failover切换

1. 自动Failover切换

(1) 模拟master mysql关闭

(2) VIP将会切换到node2

(3) /etc/masterha/app1.cnf中将原主服务器配置文件清掉。

(4) masterha_manager监控进程会自动退出关闭，并在/var/log/masterha/app1下生成app1.failover.complete文件，manager.log会记录全过程，从服务器会自动从新的主服务器复制。

(5) 原主服务器mysqld启动的，需要清掉/var/log/masterha/app1下生成app1.failover.complete文件，添加node1配置文件到/etc/masterha/app1.cnf，通过manager.log中的记录的故障点，重新同步主服务器，成为从节点。

2. 手动Failover切换

(1) 先停MHA Manager进程。

masterha_stop --conf=/etc/masterha/app1.cnf

(2) 停掉master mysqld

(3) 手动切换，在Manager主机上操作如下：

# masterha_master_switch --master_state=dead --conf=/etc/masterha/app1.cnf --dead_master_host=192.168.1.122 --dead_master_port=3306 --new_master_host=192.168.1.121 --new_master_port=3306 --ignore_last_failover

通过观察日志可以观察切换全过程。

(4) 如上节方式恢复节点为从服务器。

3. 正常运行情况下切换(Master正在运行)

等补充。

4. 小结

通过对MMM，MHA的环境搭建测试，MHA由于采用复制架构，原理简单，在一些对数据要求比较高的环境，为了保证可靠性，最好与半同步结合使用。

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